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net: dsa: b53: Set correct number of ports in the DSA struct

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[ Upstream commit d12e1c4649883e8ca5e8ff341e1948b3b6313259 ]

Setting DSA_MAX_PORTS caused DSA to call b53 callbacks (e.g.
b53_disable_port() during dsa_register_switch()) for invalid
(non-existent) ports. That made b53 modify unrelated registers and is
one of reasons for a broken BCM5301x support.

This problem exists for years but DSA_MAX_PORTS usage has changed few
times. It seems the most accurate to reference commit dropping
dsa_switch_alloc() in the Fixes tag.

Fixes: 7e99e34701 ("net: dsa: remove dsa_switch_alloc helper")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafał Miłecki 2021-09-02 10:30:51 +02:00 committed by Greg Kroah-Hartman
parent 0db7e0d9f6
commit c361c95560
1 changed files with 2 additions and 1 deletions
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3
drivers/net/dsa/b53/b53_common.c
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@ -2559,6 +2559,8 @@ static int b53_switch_init(struct b53_device *dev)
dev->enabled_ports |= BIT(dev->cpu_port);
dev->num_ports = fls(dev->enabled_ports);
dev->ds->num_ports = min_t(unsigned int, dev->num_ports, DSA_MAX_PORTS);
/* Include non standard CPU port built-in PHYs to be probed */
if (is539x(dev) || is531x5(dev)) {
for (i = 0; i < dev->num_ports; i++) {
@ -2603,7 +2605,6 @@ struct b53_device *b53_switch_alloc(struct device *base,
return NULL;
ds->dev = base;
ds->num_ports = DSA_MAX_PORTS;
dev = devm_kzalloc(base, sizeof(*dev), GFP_KERNEL);
if (!dev)